In the raising of the standard of farming to an English level the volume of the world's crop would be trebled, another fact which Sir William Crookes seems to have overlooked.
The trade of Belgium has more than trebled as regards both imports and exports since 1870.
The greatest gainers by the redistribution were the Ruthenes, whose representation was trebled, though it is still far from being proportioned to their numbers.
The figure was doubled by 1895 and trebled in 1897; in spite of prohibitions, imports into Persia continued on a large scale.
Their product trebled from 1889 to 1903; and in 1907 the output of manganiferous ores amounted to 99,711 tons, valued at $251,207.
The minimum is practically always exceeded, and trebled or quadrupled in the case of the more enthusiastic men, and the chief difficulty with which the officers responsible for training have to contend is the fact that no man can be compelled to attend on any particular occasion.
Prague was his favourite residence, and by the foundation of the nove mesto (new town) he greatly enlarged the city, which now had three times its former extent, and soon also trebled its population.
The American War of Independence suspended progress for a brief interval, but revival set in in 1783, and within the following seven years shipping trebled in amount.
In the west and south-west, chiefly in Clay, Vigo, Sullivan, Vermilion and Greene counties, yielded in 1902 9,446,424 tons, valued at $10,399,660; in 1907, 1 3,9 8 5,7 1 3 tons, valued at $15,114,300; the production more than trebled since 1896, when it was 3,905,779 tons.
The land-tax was doubled and trebled by war, by the pensions of the nobles, by an extortion the profits of which Richelieu disdained neither for himself nor for his family; and just when the richer and more powerful classes had been freed from taxes, causing the wholesale oppression of the poorer, these few remaining were jointly and severally answerable.
From 1880 to 1890 the acreage devoted to wheat greatly diminished, because the spring variety was not relatively remunerative, but the acreage trebled in the next decade as autumn planting increased.
The personnel on active service consisted of 1799 officers and 25,000 men, the former being doubled and the latter trebled since 1882.
Within the cities and upon the open lands the Italians, in this and the next century, doubled, trebled and quadrupled their numbers.
The total national debt of Russia nearly trebled between 1852 (£57,038,600) and 1862 (£145,50o,000), and again between 1872 (£242,277,000) and 1892 (£526,109.000) it more than doubled, while by 1906 it amounted altogether to £812,040,000.
Then immigration began to fill the deserted plains once more, and by 1785 the population had trebled itself.
The production of coal and iron trebled during the period 1880-1900, amounting in 1900 to 6,600,000 tons, and 463,000 tons respectively.
The worlds output of oil was trebled between 1885 and 1895, and quadrupled between 1885 and 1900.
A great amount of doubled and trebled yarn is now sold, though it does not appear that recent expansions have added much to doubling spindles, and considerable developments continue in the use of dyed and mercerized yarns.
The parcel post and money order services have largely increased since 1887--1888, the number of parcels having almost doubled (those for abroad are more than trebled), while the number of money orders issued is trebled and their value doubled (about 40,000,000).